Rorippa barbareifolia, the hoary yellowcress, is a plant species reported from Manchuria, Inner Mongolia, Mongolia, Siberia, Alaska, Yukon and Saskatchewan. It grows in wet habitats (though not completely submerged). It can be found along forest borders, in ditches, on stream banks, etc.Flora of North AmericaFlora of China
Rorippa barbareifolia can easily be distinguished from other species in the genus by its multi-valved fruits. Rorippa barbareifolia fruits have 3-6 valves, usually 4, while other species generally have 2, rarely 3. The plants are annual herbs with yellow, 4-parted flowers.Kitagawa, Masao. Journal of Japanese Botany 13(2): 137. 1937.Hultén, Oskar Eric Gunnar. Flora of Alaska and Yukon 5: 829. 1945.Porsild, Alf Erling. Rhodora 41: 232. 1939.Welsh, Stanley Larson. Great Basin Naturalist 28(3): 152. 1968.
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